What's wrong with my dell battery?

[lukyo]

Hey guys and gals,
I've had my laptop for about 5-6 weeks. Its a DELL Alienware M15x and I have never replaced the battery . The past 3 weeks or so the battery can only charge when the computer is off or in a low power state. If its on and plugged in it will still lose its charge unless its already at 100%. On a full charge without being plugged in it only holds its charge for about 1 hour on "power saver". This makes it extremely hard to use it as a portable device so i'm trying to find a way to troubleshoot the problem without having to buy a new battery or laptop. Unfortunately I need it for the next few months in some of my classes so its kind of urgent,and my battery is like this De grootste accu DELL Alienware M15x Series leverancier die de hoogste kwaliteit en gloednieuwe DELL Alienware M15x Series batterij/DELL Alienware M15x Series Adapter goedkope, snelle levering. .
Thanks for your help!